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Finding the Fourth Proportional to 1,322.89, 1,984.32 and 553.39

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Solution

The fourth proportional to 1,322.89, 1,984.32 and 553.39 is: 830.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.89 : 1,984.32 = 553.39 : x
  2. Step 2: Convert to fraction form
    1,322.89/1,984.32 = 553.39/x
  3. Step 3: Cross multiply
    1,322.89x = 1,984.32 × 553.39
  4. Step 4: Simplify right side
    1,322.89x = 1,098,102.84
  5. Step 5: Solve for x
    x = 1,098,102.84/1,322.89
  6. Step 6: Final answer
    x = 830.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.